C- Strange warnings from codeblocks

Question

When i compile and run the following code, codeblocks(windows 7 64-bit) issues a couple of warnings:-

#include<stdio.h>
#include<stdlib.h>
extern int i=10;     //Warning

int main()
   {
       extern int i;
       printf("%d\n",i);
   }

int i;

The warnings are as follows:-

Line 3: warning: 'i' initialized and declared 'extern' [enabled by default]

Any explanation for this warning?

score 3 · Accepted Answer · edited May 23 '17 at 11:49

3

Taken the help from here

Thats a valid syntax. The problem is that extern keyword is redundant because the object is initialised in the same compilation unit.

edited May 23 '17 at 11:49

Community

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answered Sep 05 '13 at 19:40

Rahul Tripathi

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that doesn't solve the problem,in fact, it makes it even worse. – chanzerre Sep 05 '13 at 19:46
Please refer to this-http://stackoverflow.com/questions/2348700/doubt-related-to-extern-keyword-usage – chanzerre Sep 05 '13 at 19:51
@BradLarson:- But since I have updated my answer I didnt attributed that!!! – Rahul Tripathi Sep 06 '13 at 15:32

score 1 · Answer 2 · answered Sep 05 '13 at 19:41

1

That's normal, « extern i ; » means « Okay, there is a variable i somewhere in another file (already initialized). », and you try to affect to it a new value!

I think you should have a look at the « extern » key word.

answered Sep 05 '13 at 19:41

Holt

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C- Strange warnings from codeblocks

2 Answers2